fix: `FindKthNumberTest`

[alxkm]

In some cases, this code generates incorrect arrays, causing the test to not pass.

The issue happens due to improper constraints on the generated arrays. This was identified in a few previous builds.

This PR addresses the issue and has been thoroughly tested.

• [x] I have read CONTRIBUTING.md.
• [x] This pull request is all my own work -- I have not plagiarized it.
• [x] All filenames are in PascalCase.
• [x] All functions and variable names follow Java naming conventions.
• [x] All new algorithms have a URL in their comments that points to Wikipedia or other similar explanations.
• [x] All new code is formatted with clang-format -i --style=file path/to/your/file.java

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 51.25%. Comparing base (e0a1164) to head (e802eff).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #5444 +/- ## ========================================= Coverage 51.25% 51.25% Complexity 3193 3193 ========================================= Files 524 524 Lines 15194 15194 Branches 2893 2893 ========================================= Hits 7788 7788 Misses 7084 7084 Partials 322 322 ```

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